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Spark Plugs: Installation

CAUTION: Special care should be used when installing spark plugs in the cylinder head spark plug wells. Be sure the plugs do not drop into the wells, damage to the electrodes can occur. Always tighten spark plugs to specification. Overtightening can cause distortion resulting in a change in the spark plug gap. Overtightening can also damage the cylinder head.
  1. To avoid cross threading, start the spark plug into the cylinder head by hand. The tapered seat plugs for this application are torque-critical. It is imperative that the specified torque is not exceeded. See TORQUE SPECIFICATIONS .
  2. Install spark plug insulators over spark plugs. Ensure the top of the spark plug insulator covers the upper end of the spark plug tube. Install spark plug cable to coil. See Figure. Install the upper intake manifold. See appropriate article in ENGINES.
  3. Reconnect the negative battery cable. Install the air cleaner lid, and connect the inlet air temperature sensor and air hose.
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